gfortran -o f90_fem_heat f90_fem_heat.f90
gfortran -o f90_num_heat f90_num_heat.f90


./f90_fem_heat inp_test00_div4.csv out_test00_div4.csv
./f90_fem_heat inp_test11_div4.csv out_test11_div4.csv
./f90_fem_heat inp_test22_div4_01.csv out_test22_div4_01.csv
./f90_fem_heat inp_test22_div4_10.csv out_test22_div4_10.csv
./f90_fem_heat inp_test22_div4_50.csv out_test22_div4_50.csv